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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. Which of the following describe the functions of a scheduling algorithm? (Choose 4)

A) Allow short Jobs to complete even when large, long jobs (consuming a lot of resources) are running.
B) Allow multiple users to share clusters in a predictable, policy-guided manner.
C) Reduce the total amount of computation necessary to complete a job.
D) Reduce job latencies in an environment with multiple jobs of different sizes.
E) Support the implementation of service-level agreements for multiple cluster users.
F) Run jobs at periodic times of the day.

2. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) The third block will be 64MB
B) Each block will be replicated nine times
C) Each block will be replicated three times
D) Two of the initial blocks will be 128MB
E) The third Initial block will be 44 MB
F) The file will be split into three blocks when initially written into the cluster
G) The file will consume 1152MB of space in the cluster
H) All three blocks will be 128MB

3. What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A) After a period of time, the TaskTracker will kill the Map Task.
B) The job will immediately fail.
C) After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running
D) The Mapper will run indefinitely; the TaskTracker must be restarted to kill it

4. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.
B) Run hadoop dfsadmin -report and locate the DFS Remaining value.
C) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.
D) Run hadoop fs -du/and locate the DFS Remaining value.

5. You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit job B, Now job A and job B are running on the cluster at the same time.
Which of the following describes how the Fair Scheduler operates? (Choose 2)

A) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
B) When job A gets submitted, it doesn't consume all the task slots.
C) When job B gets submitted, job A has to finish first, before job B can get scheduled.
D) When job A gets submitted, it consumes all the task slots.

Solutions: